<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      @click-left="$router.back()"
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="isLoading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <!-- TODO: 关注用户 -->

          <FollowUser :userId="article.aut_id" :is_followed.sync="article.is_followed"></FollowUser>

          <!-- <FollowUser :userId="article.aut_id" v-model="article.is_followed"></FollowUser> -->

          <!-- <FollowUser
            :userId="article.aut_id"
            :is_followed="article.is_followed"
            @update-follow="article.is_followed = $event"
          ></FollowUser> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" ref="contentRef" v-html="article.content"></div>
        <van-divider>正文结束</van-divider>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small">写评论</van-button>
      <van-icon name="comment-o" info="123" color="#777" />
      <van-icon color="#777" name="star-o" />
      <van-icon color="#777" name="good-job-o" />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  data() {
    return {
      article: {},
      isLoading: true, // 控制是否正在加载中
      errStatus: 0,
      isFollowLoading: false,
    }
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticelDetail()
  },

  mounted() {},
  methods: {
    async loadArticelDetail() {
      // 7841
      try {
        // throw Error()
        let res = await getArticleById(this.articleId)
        console.log('文章详情', res.data)

        // 模型步骤1.1 : 修改 data 里面的数据
        this.article = res.data.data

        // ok
        // 特性 : 延时 +异步
        // setTimeout(() => {
        //   this.previewImage()
        // }, 10)

        // 不ok
        // 特性 : 等待
        // 模型步骤1.2 : 修改 data 里面的数据
        this.isLoading = false //把这个加上 就ok了
        this.$nextTick(() => {
          // 模型步骤2 : 操作DOM
          this.previewImage()
        })
      } catch (error) {
        if (error.response.status === 404) {
          this.errStatus = 404
        }
      }
      this.isLoading = false
    },
    // 预览图片
    previewImage() {
      // ref ~~ id

      const contentEl = this.$refs.contentRef
      const allImg = contentEl.querySelectorAll('img')
      let images = [] // 里面的src 都是为了预览使用
      allImg.forEach((element, index) => {
        // console.log('yulan:', element.src)
        images.push(element.src)
        element.onclick = function () {
          ImagePreview({
            images,
            startPosition: index,
          })
        }
      })
    },
    // fn(e) {
    //   this.article.is_followed = e
    // },
  },
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}

/deep/ .van-nav-bar .van-icon {
  color: #fff;
}
</style>
